Results 21 to 30 of about 801,967 (275)

Chemoselective α‑Sulfidation of Amides Using Sulfoxide Reagents [PDF]

, 2020
The direct α-sulfidation of tertiary amides using sulfoxide reagents under electrophilic amide activation conditions is described. Employing convenient and readily available reagents, selective functionalization takes place to generate isolable sulfonium
Movassaghi, Mohammad, Mohammad, Movassaghi, D’Angelo, Kyan A, Leypold, Mario, Mario, Leypold, Kyan A., D’Angelo   +5 more
core   +3 more sources

Hydrothermal alteration, mineralization and fluid inclusions in the Pista and Fofão prospects: implications for the genetic model of the Coringa polymetallic deposit, SE Tapajós Mineral Province, Amazonian Craton, Brazil

Journal of the Geological Survey of Brazil, 2020
Pista and Fofão are a prospect located near the main orebodies of the Coringa polymetallic deposit, in southeastern Tapajós Mineral Province of the Amazonian Craton. In both prospects, the mineralization is hosted in an Orosirian alkali feldspar granite,
Rafael Guimarães Corrêa Lima, Evandro Luiz Klein   +1 more
doaj   +1 more source

The effect of chemical variability and weathering on Raman spectra of enargite and fahlore [PDF]

European Journal of Mineralogy, 2023
Enargite (Cu3AsS4) and tennantite (Cu12As4S13) are typical As-bearing sulfides in intermediate- and high-sulfidation epithermal deposits. Trace and major element variations in enargite and tennantite and their substitution mechanisms are widely described.
K. Berkh, J. Majzlan, J. A. Meima, J. Plášil, D. Rammlmair   +4 more
doaj   +1 more source

Mineralization, Alteration Assemblages and Stable Isotopes of the Intermediate-Sulfidation Epithermal Strauss Deposit, Drake Goldfield, North-Eastern NSW, Australia [PDF]

The 2nd International Electronic Conference on Mineral Science, 2021
The intermediate-sulfidation epithermal Strauss deposit is part of the Drake Goldfield of north-eastern NSW. The mineralisation in this deposit is gold-dominant with minor silver and significant levels of zinc, copper and lead. Strauss has a combined total resource of 2.66 Mt @ 1.5g/T Au and 1.9g/T Ag.
Emmanuel Madayag, Ian Graham, Hongyan Quan, Rohan Worland, Lewis Adler, Christian Dietz   +5 more
openaire   +1 more source

Nanomaterial accumulation in boiling brines enhances epithermal bonanzas

Scientific Reports, 2023
Epithermal bonanza-type ores, characterized by weight-percent contents of e.g., gold and silver in a few mm to cm, are generated by mixtures of magmatic-derived hydrothermal brines and external fluids (e.g., meteoric) that transport a variety of metals ...
Néstor Cano, José M. González-Jiménez, Antoni Camprubí, Diego Domínguez-Carretero, Eduardo González-Partida, Joaquín A. Proenza   +5 more
doaj   +1 more source

Atomistic reaction mechanism of CVD grown MoS2 through MoO3 and H2S precursors

Scientific Reports, 2022
Chemical vapor deposition (CVD) through sulfidation of MoO3 is one of the most important synthesis techniques to obtain large-scale and high-quality two-dimensional (2D) MoS2.
Abdullah Arafat, Md. Sherajul Islam, Naim Ferdous, A. S. M. Jannatul Islam, Md. Mosarof Hossain Sarkar, Catherine Stampfl, Jeongwon Park   +6 more
doaj   +1 more source

Temperature condition, sulfidation state, and gold formation mechanism of the Atash- Anbar polymetallic deposit (south Qazvin) based on mineralization, alteration and chemistry of ore minerals [PDF]

پترولوژی, 2022
The NW-trending Urumieh-Dokhtar Magmatic Belt (UDMA) in the central-western Iran is a part of the Eastern Tethyan orogenic belt (Deng et al., 2018) and over past decades, it has become one of the most significant polymetallic (Au-Cu-Fe-Pb-Zn) provinces ...
Ebrahim Tale Fazel, Narges Alaei Moghtader, Abbas Oroji   +2 more
doaj   +1 more source

Geology, Vein Textures, and Fluid Inclusions of the Cibeber Low-Intermediate Sulfidation Epithermal Au-Ag Orefield, Western Java

Indonesian Journal on Geoscience, 2021
DOI:10.17014/ijog.8.2.157-175This paper describes the results of surficial geological and alteration mapping combined with several laboratory analyses, including petrography, ore microscopy, ore geochemistry, and fluid inclusion studies, aimed at establishing the nature of mineralization and alteration in the Cibeber area, West Java, Indonesia, and ...
Dana, Cendi D.P.; id_orcid 0000-0002-4511-156X, Idrus, Arifudin, Setiawan, Iwan, Handayani, Esti, Yurniadi, Feddy, Meak, Ignas A., Lai, Chun Kit   +6 more
openaire   +2 more sources

Preliminary mineralogy and ore petrology of the intermediate-sulfidation Pallancata Deposit, Ayacucho, Peru

The Canadian Mineralogist, 2013
Se investiga la compleja mineralogía del Yacimiento de Pallancata (6º productor de plata del mundo) y se establecen las condiciones de formación (P.T) basadas en la petrología de las menas comparada con los datos de mineralogía experimental y en la petrografía y microtermometría de inclusiones fluídas en la ganga silicatada, resultando un depósito ...
Gamarra-Urrunaga, Jorge E., Castroviejo Bolibar, Ricardo, Bernhardt, Heinz-Jurgen   +2 more
openaire   +2 more sources

Hydrothermal alteration and mineralization of the prospects at the northern flank of the Baimka ore zone, Western Chukotka

Известия высших учебных заведений: Геология и разведка, 2021
Background. Some papers describing the deposits and prospects in the Baimka ore zone (Baimka Trend), the Chukotka Autonomous Region have been recently published.
A. V. Yusupova, I. A. Baksheev, N. N. Koshlyakova   +2 more
doaj   +1 more source